Unveiled in late 2008, Princess Cruises' 3,080-passenger Ruby Princess is one of the line's newest vessels. Courtesy Princess Cruises

At 116,000 tons, the Ruby Princess is one of three sister ships that are among the largest in the Princess fleet. Its siblings, all similar in layout and look: The Crown Princess and Emerald Princess. Courtesy Princess Cruises

Ruby Princess offers four pool areas, including the Terrace Pool on the back of the ship. Courtesy Princess Cruises

The Calypso Reef and Pool area is designed with tiered seating from which passengers can watch movies projected on one of Princess' trademark Movies Under the Stars outdoor screens. Courtesy Princess Cruises

Yet another pool and two hot tubs are found at the Ruby Princess' Lotus Spa. Courtesy Princess Cruises

The Sanctuary is an extra-fee, adults-only zone that features a spacious sundeck with lounge chairs, tables and umbrellas. As of late 2010, the cost to enter was $10 per person for a half day. Courtesy Princess Cruises

The Ruby Princess is home to a nine-hole putting golf course called Princess Links. Courtesy Princess Cruises

One of the first things passengers see upon boarding the vessel is the soaring Atrium. Courtesy Princess Cruises

Another view of the Atrium. Courtesy Princess Cruises

Like other Princess ships, the Ruby Princess has a central, three-deck-high Piazza that serves as a hub for the vessel and is the scene of daily entertainment including street performers, piano players, singers and more. Courtesy Princess Cruises

Another view of the Piazza. Courtesy Princess Cruises

Located at the ground level of the Piazza, the International Café offers up sandwiches, desserts and extra-charge specialty coffees. Courtesy Princess Cruises

Princess ships are known for their wide variety of bars and lounges. Here, the Crooners lounge, where live piano music provides the backdrop. Courtesy Princess Cruises

The Explorers Lounge is home to comedy shows and live music by night, with art auctions and other activities scheduled in the room during the day. Courtesy Princess Cruises

Another popular lounge is Adagio, which serves up live piano music and occasional jazz nights with a band. Courtesy Princess Cruises

The Botticelli Dining Room is one of three main dining rooms on the ship and offers assigned-seating dining nightly. Courtesy Princess Cruises

The Da Vinci Dining Room, shown here, and the Michelangelo Dining Room are the main dining rooms for passengers who sign up for the line's more flexible, eat-when-you-want Anytime Dining program. Courtesy Princess Cruises

The Michelangelo Dining Room. Courtesy Princess Cruises

One of several alternative, extra-fee dining choices on Ruby Princess is the Crown Grill, which serves up steaks and seafood. The cover charge is $25 per person. Courtesy Princess Cruises

Another extra-charge dining option is Sabatini's, an elegant Italian eatery that's known for sumptuous courses that keep on coming. The cover charge is $20 per person. Courtesy Princess Cruises

Located around the Piazza, Vines is a wine bar that also serves up light fare. Courtesy Princess Cruises

An inside cabin on the Ruby Princess, which measures in at 163 square feet. Michel Verdure, Princess Cruises

Among more upscale lodging options on the Ruby Princess are its 178 mini-suites, which measure in at 324 square feet. Michel Verdure, Princess Cruises

There are also a number of bigger suites on Ruby Princess that measure from 461 to 687 square feet (about two to three times the size of standard cabins). Michel Verdure, Princess Cruises

The Center Court on the top deck of the Ruby Princess. Courtesy Princess Cruises

Like all Princess ships, the Ruby Princess offers a relatively large casino. Dubbed Gatsbys, it houses table games and more than 250 slot machines. Courtesy Princess Cruises

Known for its appeal to passengers of all ages, from toddlers to their grandparents, Princess offers a comprehensive kids program on Ruby Princess that includes a dedicated kids center. Courtesy Princess Cruises

The Ruby Princess' cozy library. Courtesy Princess Cruises

The Internet Café on the Ruby Princess has 25 computer stations where passengers can check their emails and navigate the Internet for a charge. Courtesy Princess Cruises

Open daily from 7 am to 10 pm, the Ruby Princess' large fitness center overlooks the bow of the ship and offers treadmills, elliptical machines, exercise bikes and more. Courtesy Princess Cruises